OneDrive Error Codes

How to Fix OneDrive 404 File Not Found Error for Existing Files

Maira Mehtab Sep 21, 2026 869 views

Question details

Users are experiencing a 404 File Not Found error when attempting to open previously stored files in a personal OneDrive account, whereas newly uploaded files open normally.

Product: Microsoft OneDrive
Device & OS: not provided
Scenario: Opening existing, previously synchronized files stored in a personal OneDrive account.
Observed behavior: Previously stored files return a 404 File Not Found error across OneDrive.com or the desktop sync folder, while newly uploaded files function correctly.

Before you start

Before troubleshooting your local settings, check the official Microsoft Service Health status page to verify if there is an ongoing server outage affecting OneDrive file access.

Solution 1Recommended

Troubleshoot Access Points and Network Settings

Isolate the root cause by accessing your files through alternative Microsoft platforms and different network connections.

Often, a 404 error is isolated to a specific platform or network cache. By testing different entry points, you can determine if the issue is a local synchronization error or a wider server issue.

Check OneDrive on the Web

Log in to OneDrive.com via your web browser to see if the files open there instead of failing in the local desktop synchronization folder.

Test the OneDrive Mobile App

Open the Microsoft OneDrive mobile app on your smartphone or tablet to check if the existing files are accessible from a mobile device.

Open from Office Recent List

Launch a Microsoft Office application (like Word or Excel), click on 'File', select 'Start', and navigate to the 'Recent' list. Attempt to open the affected file directly from this menu.

Switch Your Network Connection

Connect your device to a different network, such as a mobile hotspot, to rule out local network restrictions or proxy configuration issues.

Temporary Server Glitch: If files open on the mobile app but not on the desktop, it may be a temporary synchronization delay that often resolves itself once Microsoft patches the backend servers.

Solution 2

Report the Issue to Microsoft Support

If the 404 error persists across multiple devices and networks, escalate the issue directly to Microsoft for an account-level fix.

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1. Download and Install WPS Office: Visit the official WPS website to download the free application and install it on your computer or mobile device.
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Frequently Asked Questions

Why does OneDrive show a 404 File Not Found error for old files but not new ones?

This typically occurs due to a backend synchronization issue or server-side glitch within Microsoft's infrastructure. The server temporarily loses the link to previously indexed files, while newly uploaded files are processed through active, functioning server paths.

Are my files permanently deleted if OneDrive returns a 404 error?

No, a 404 error in this specific context usually means the server pathway is temporarily broken, not that the files are permanently erased. Your data remains intact on Microsoft's servers and is typically restored once they deploy a backend fix.

How can I check if OneDrive is experiencing a server outage?

You can visit the official Microsoft Service Health status page online. It displays real-time updates on active incidents, outages, or known bugs affecting OneDrive and other Microsoft 365 services.

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